Revision of Ommatius Wiedemann (Diptera: Asilidae). IV. Pygommatius subgen. nov. with twenty-five Afrotropical species Author Scarbrough, Aubrey G. Department of Biological Sciences, Towson University, Baltimore, MD 21252, USA; Author Marascia, Claudio G. text Zootaxa 2003 2003-07-04 228 1 1 94 http://biotaxa.org/Zootaxa/article/view/zootaxa.228.1.1 journal article 5623 10.11646/zootaxa.228.1.1 081ba61b-c79c-401c-a265-060a46979cd2 1175­5334 5019043 AC9F77DE-F702-4620-B756-D753E77FBC73 Ommatius (Pygommatius) strigiatus , sp. n. Figs. 20 , 27 , 37 , 47 , 210­217 Male. Black. Length, body 8.1­9.5 mm ; wing 5.7­6.7. Head : Yellowish­gray to gray tomentose, white setose. Face with sparse, short setae dorsally, longer and slightly more abundant setae ventrally; 4 pencil­like white bristles ventrally and 6 thin, black bristles present; FHWR 1.0:5.9­1.0:6.1. Frons dull brown to brown­yellow tomentose. Antenna with pedicel swollen, wider and slightly longer than flagellum. Ocellar tubercle with 2 posterior setae as long as 3 antennal segments combined. Occiput with 4­5 black postocular bristles dorsally, tip of longest bristle about third distance toward ocellar tubercle. Thorax : Mesonotum subshiny, mostly brown tomentose, grooves, sides, and posterior brown­yellow to yellowish­gray; setae mostly black, sparse, scattered anteriorly; white setae abundant laterally, especially long on postpronotum and between rows of dorsocentral bristles posteriorly; 4­5 lateral and dorsocentral black bristles present. Scutellum brown­yellow tomentose dorsally, gray apically with scattered, long, white setae; 2 black marginal bristles and a shallow preapical groove present. Pleuron black, mostly gray tomentose, with scattered, white setae and bristles; anepisternum yellowish­gray. Halter yellow. Wing ( Fig. 20 ): Apical and posterior margins narrowly dense microtrichose. Cell r 4 uniformly narrow beyond base to wing margin. Apex of cell m 3 perpendicular to long axis of wing, just beyond crossvein r­m. Leg : Coxae and trochanters black, former gray tomentose with white setae. Femora mostly yellow; fore and middle femora anteriorly mostly black; hind femur with apical half black, at least dorsally. Fore and middle femora basally with 4­6 thick, yellow bristles, the basal bristle unusually long, about half as long as fore femur ( Fig. 27 ), each bristle thereafter shorter and thinner; middle femur with bristles much thinner, shorter than on fore femur. Hind femur ( Fig. 37 ) narrow basoventrally, widest on basal one­fifth; 1 short setigerous bristle and 6­8 long, thin, yellow anteroventral setae present; 5­7 short, peglike, black bristles basoposteriorly and 2 long, brown, bristles present preapically; HFWLR 1.0:4.4­1.0:5.0. Tibiae yellow with dark apex, fore tibia sometimes entirely yellow; lateral bristles yellow. Hind tibia ( Fig. 47 ) shorter than hind tarsus; apically, a short flange terminates in a raised anterior spur and a small tubercle present, each with a black bristle. Tarsi mostly black except basal tarsomeres mostly yellow; bristles black except 1 fore tarsal bristle yellow; basal tarsomere of middle tarsus laterally with row of short, closely spaced, bristles. Abdomen : Constricted apically, segments 6­8 about half as wide as segment 2. Ground color black with apical margins of most segments brownish­yellow; tomentum mostly brown dorsally, lighter brownish­gray laterally and ventrally; mostly white setose, tergites black setose medially. Sternite 4 laterally with 6­7 white bristles; sternite 5 with row of very short bristles, each very light in color and with a large socket, the row ends apically with a small oval patch of 7­8 very short black and white bristles; sternite 6 with numerous white bristles, those of sternite 8 apically contrastingly long. Terminalia ( Figs. 210­214 ): Ventral lamellae basally with ear­like process; process dense setose. Epandrium 2 branched; dorsal branch apically narrow, podiform; ventral branch forked apically. Gonocoxite with internal flange fused with external surface, not projecting posteriorly. Aedeagal sheath projecting above distiphallus as a flat, grooved, oval plate. Hypandrium with extremely narrow, pointed, drooping apex; surface with minute grooves and ridges. Female. Differs from male as follows. Length, body 6.7­11.5 mm ; wing 5.9­7.7 mm . Head : FHWR 5.6­1.0:6.7. Leg: Fore and middle femora basally with only 3­4 long, thin setae. Hind femur anteroventrally with 4­5 bristly setae, longest as great as width of femora medially; HFWLR 1.0:5.9­1.0:6.0. Middle tarsus anteriorly with only 3 short bristles. Abdomen : Bristle pattern of sternites 4­6 absent. Cercus longer than tergite 9. Terminalia ( Figs. 215­217 ): Three spermathecae present; duct basal. Apical margin of sternite 8 with notch admedially. SPECIMENS EXAMINED. Holotype ♂ , allotype ♀ , SOUTH AFRICA : N­W Province / Pilanesberg National Park / Bakiburg 25 o 20’40”S 27 o 03’25”E 1170 m Camp / 12­ 19.xi.1999 / JGH Londt ( NMSA ) . Paratypes : BOTSWANA : 1 ♂ , Serowe / Farmer’s Brigade / x. 1991 SE2226BD / Per Forchammer / Malaise Trap ( CMNH ) ; 2 ♂ , Serowe # 56 / Farmer's Brigade / 22° 25 S : 26° 14' E 1000 m / 28.xi.1990 / D. Forchhammer / malaise trap ( NMSA ) . SOUTH AFRICA : 4 ♂ , 3 ♀ , same data as holotype ( NMSA ) . Distribution. A species captured in November at 1000 meters in Botswana and South Africa . Etymology. Latin, strigiatus , for grooves and ridges, referring to the surface of the hypandrium. Remarks. In addition to the characters in the key, the uniformly narrow cell r 4 ( Fig. 20 ) and short tibia ( Fig. 47 ) further characterize O. strigiatus .